Devicehigh & Drivespace in Config.sys

I have a Win98 computer with has an entry in Config.sys, Devicehigh=c:\windows\command\drvspace.sys /move.
I have never used DriveSpace on this computer except possibly compressing a floppy disk once. Doing so, did DriveSpace put this entry in Config.sys? and what does the /move switch mean? I know it is loading it into high memory.